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[Faced with Katerina's warning and invitation, you choose...]
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The options are 'agree' and 'refuse'.
Mu You hardly hesitated before choosing to refuse.
In fact, after the evolution of the blood niche, he no longer needed to rely on clearing this server to initiate the Blood God Faith. He could collect some Divine Blood outside and still ascend to the 10th generation, embarking on the Path of the Blood God. So leaving right now was an option for him.
The reason he chose to stay was for the purpose of collecting the Blood Rhythm.
The Blood God was unlike other deities who could unlock Divine Arts one by one through a pool of faith, instantly learning them by investing Divinity.
All of the "Blood Rhythm" developed by the Blood God in the past had been passed down through bloodlines, scattered among the offspring, with the Vampires being the only other way to access them.